I had a problem with my mac where I couldn't save any kind of file on the disk anymore. I had to reboot OSX lion and reset the permissions on files and acls.

But now when I want to commit a repository I get the following error from ssh:

Permissions 0777 for '/Users/username/.ssh/id_rsa' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.
What permissions levels should i give to the id_rsa file?

别人那边拷贝过来的密钥，很多时候无法直接登录ssh，会报错permissions are too open。
这个时候需要修改id_rsa的权限，一般修改为600就好。

Keys need to be only readable by you:

chmod 400 ~/.ssh/id_rsa
600 appears to be fine as well (in fact better in most cases, because you don't need to change file permissions to edit it).